Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Effect of Body Mass Index on Global DNA Methylation in Healthy Korean Women

  • Na, Yeon Kyung (College of Nursing, School of Medicine, Kyungpook National University) ;
  • Hong, Hae Sook (College of Nursing, School of Medicine, Kyungpook National University) ;
  • Lee, Duk Hee (Department of Preventive Medicine, School of Medicine, Kyungpook National University) ;
  • Lee, Won Kee (Department of Preventive Medicine, School of Medicine, Kyungpook National University) ;
  • Kim, Dong Sun (Department of Anatomy and Brain Korea 21 Plus KNU Biomedical Convergence Program)
  • Received : 2014.03.27
  • Accepted : 2014.05.26
  • Published : 2014.06.30
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Abstract

Obesity is known to be strongly associated with cardiovascular disease and cancer, the leading causes of mortality worldwide, and develops owing to interactions between genes and the environment. DNA methylation can act as a downstream effector of environmental signals, and analysis of this process therefore holds substantial promise for identifying mechanisms through which genetic and environmental factors jointly contribute to disease risk. Global DNA methylation of peripheral blood cells has recently been proposed as a potential biomarker for disease risk. Repetitive element DNA methylation has been shown to be associated with prominent obesity-related chronic diseases, but little is known about its relationship with weight status. In this study, we quantified the methylation of Alu elements in the peripheral blood DNA of 244 healthy women with a range of body mass indexes (BMIs) using pyrosequencing technology. Among the study participants, certain clinical laboratory parameters, including hemoglobin, serum glutamic oxaloacetic transaminase, serum glutamic- pyruvic transaminase, total cholesterol, and triglyceride levels were found to be strongly associated with BMI. Moreover, a U-shaped association between BMI and Alu methylation was observed, with the lowest methylation levels occurring at BMIs of between 23 and $30kg/m^2$. However, there was no significant association between Alu methylation and age, smoking status, or alcohol consumption. Overall, we identified a differential influence of BMI on global DNA methylation in healthy Korean women, indicating that BMI-related changes in Alu methylation might play a complex role in the etiology and pathogenesis of obesity. Further studies are required to elucidate the mechanisms underlying this relationship.

Keywords

References

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